Air pump



sept, 22, 1.925.

' F. C. FROELICH AIR PUMP 4 sheets-sheet 1 Original Filed Nov. 23, 1922Sept' AIR PUMP origial Fned Nav. 2s, 1922 4 sheets-sheet 2 INVENTOR:

ATTOR s Sept. 22, 1925.

F. C. FR OELlClji AIR PUMP vOriginal Filed Nov. 23. 1922 A{Sheets-Sheet.5

INVENTOR:

'f ATTORNEYS sept. 22, 1925. V1,554,628

F. C. FROELICH AIR 21m? Original Filed Nov. 23, 1922 4 Sheets-Sheet 4Il| i "Hum l 27g, LQ.

UNL/NE .9-9 FIG. 7.

INVENTOR:

e gw.

f ATTORNEV Patented Sept. 22, 1925.

1s, 1924i Serial Not efabi'il zmd egunty pf Philadelphie;

lli

lwhich extend in erular f s O'ff perte 2o@ ihe ' l eryiee Wr WHW(-oceupy the with and held in place by the plugs 24 which are screwed tothe outer wallof the head 17. l l

In the neck 6 are the ports 25'one for each barrel, the same being incommunication with the interior of the barrels respectively and with theinterior of the plugs 26 whose bodies are screwed to the collars 27 onthe neck 6 and in which-are chambers for the inwardly opening ball orother valves 28, the seats of the latter being on the bases of the airinlet ports 29 in said plugs. Said valves 28 when in closed positionsare held on their seats by the springs 30 which rest upon the adjacentportions of the necks 6 and bear against said valves 28. In the innerface ofthe side wall of the cam or cam body-"'12"is thespiral groove 3lin which are received portions of the rollers 10 'carried bythe pins 11on the as has been stated.

The operation is as follows Powter is communicated tothe shaft 15 of thepump in any "suitable manner, thus rotating the cam 12 whereby therollers 10 which are engaged in the spiral groove 31 pistons -5 and thepins 11 which are attached to the pistons cause the latter to bereciprocated in the barrels. In vone throw'of the pistons which in thepresent case is to the right,

- open the valves 28 Yandvclose the valves21.

lAir is thus drawn in large volumes into the barrels through'the ports29` and 25 lfollowing the throw of the pistons. Then the piston returnsmaking the Aopposite throw when the valves 28 are forced on their seatsandA open intoy the chamber 18 Vwhen the air is forcibly injected finto:the latter and from thence directed by the nozzles 22 to a place ofservice,there being a continuous ow of air from the pump with greatpressure.

to an operating shaftY similar to ythe shaft-15 in the prior figures,but lthe exterior surface lof the` collarhastherein the spiral grooveB/l,to receive the vrollers 35 which are Asecured to ythe ends Yofy thepins 11 which are extended inwardly from'the pistons 5, but theoperation of the pump in this instance is similar to :that shown anddescribed -in Figures 1-5 inc.; Referring to Figure 7'V on the exteriorof the housing 1 is a yseries of ribs 36 radiating from said housing andseparated from each other. forming surfaces beyond said housing adaptedto cool said housing.

The pumpin either case will 1be found admirably adapted for the purposeof inflating tires and other services in garages to which uses however,I do not limit myself.

It will now be apparent that I have devsed a novel and .useful.enstructor @f air Havingthis described my invention, what I claim asnew and desire to secure by Let ters Patent, is y [1Q An air pumpcomprising in combination, a horizontally arranged housing havingacentral cylinder casing, concentrically arranged cylindersy each havinga vertically arranged valved inlet and a horizontally arranged valvedoutlet at Vthe same end' ythereof and Yhaving an elongated, horizon-,

tally disposed slot at the other end, a' pis# ton within each cylinder,a hollow camv operative for rotation around said cylindersl said camhaving an interiorly arranged spiral groove cut upon its inner face,means including a horizontally disposed, rotatable shaft passingentirely through said housing for operating said cam, a pin passingthrough each cylinder and slot, and a roller carried by each pin forengagingy within said kspiral groove forreciprocation of said cylinders.

2. An'air pump comprising in combination, a horizontally arrangedhousing having a central cylinder casing, concentrically arrangedcylinders each having a vertically arranged valved `inlet and ahorizontally arranged valved outlet at the same end v thereof, eachvalved inlet being disposed In Figuresf, 8, 9 and 10 which show an-y atright angles to the horizontal axis of a arranged slot at the other end,a piston with- I in each cylinder, a hollow cam operative for rotationaround -said cylinders said cam having an interiorly arranged spiralgroove cut upon its inner face, means including a horizontally disposed,rotatable shaft passing entirely through said housing for` operatingsaid cam, a pin passing through each cylinder and slot, and a rollercarried by each pin for engaging within said spiral groove forreciprocation of said cylinders. 3. An air pump comprisingv incombination, a horizontally arranged housing having a central cylindercasing,yconcentrically arranged cylinders each having a verticallyarranged valved inlet and a horizontally arranged valvedy outlet at thesame end thereof and having an elongated horizontally arranged slot atthe other end, a piston Within each cylinder, an annular chamberarranged at the discharge end of said housing for direct re- CePtOl Q fair as compressed in @Il Q Sad.

cylinders said chamber having a single vertical outlet, a hollow canioperative for rota-- tion around said cylinders, said cam having aninteriorly arranged spiral groove cut upon its inner face, meansincluding a horizontally disposed, rotatable shaft passing entirelythrough said housing for operating said cani, a pin passing through eachcylin der and slot, and a roller carriedkby each pin for engaging Withinsaid spiral groove A for reciprocation of said cylinders.

4. An air pulnp comprising in combination a horizontally arrangedhousing hav ing` a central cylinder casing, a horizontally arrangedshaft passing entirely through. Said housing, concentrically arrangedcylinders'each having a valved vertical inlet and a valved horizontaloutlet at the saine end thereof and having an elongated slot paralleling said shaft at the other end, a piston Within each cylinder, ahollow cam iixed to said shaft at one end said cani having af canigroove upon its inner face operative for rotation around said cylinders,means including` a roller for cooperatively engaging said carn groovepassing through the cylinder slots and connecting with the cam interiorfor reoiprocation of said cylinders, and an air outlet arranged at thesame end of the pump as its intake and paralleling said intake.

FREDERICK o. monnrorr.`

